Brake-shoe.



C. D. PETTIS.

BRAKE SHOE.

APPLICATION FILED AUG. 3, 1912.

1,065,716, Patented June 24,1913.

.29% @am 4 ya I 25594 C. D. PETTIS.

BRAKE SHOE.

APPLIOATION rum AUG. a, 1912.

1,065,716. Patented une 24,1913,

2 SHEETS-SHEET 31,29 fa. Ky/5.

al: d 28 CLIFTON D. PETTIS, 0F CHICAGC, ILLINOIS.

BRAKE-SHOE.

i Specification o( Letters Patent.

Patented Junger, 1913.

Application tiled August 3, 2912. Serial No. 713,176.

To all whom, it may concern.'

Be it. known that L, CLIE-T011 'D.PE'rr1S, a cit-izen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements Y in` Brake- Shoes, of which I do declare the. 'following to be a full, clear, and exact description, reference being had to the accompanying drawing, forming part of this specification.

The present invention has relation more particularly to that class of brake vshoes commonly known as reinforced brake shoes, in which provision is made for strengthening or reinforcing the back of the shoe so that as the cast metal body of the shoe is reduced by wear, the danger of fracture of the shoe maybe avoided.

The invention consists in the novel features of construction hereinafter described, illustrated in the accompanying drawings and particularly pointed out in the claims at the end of this specification.

Figure l1 is an inner face View of, the-back or shell for inclosing the back of the shoe. Fig. 2 is a view similar to Fig. 1 'after the attaching lugs have, been connected to the back or shell. fFig. 3 is an outer face view or plan of the completedshoe. Fig 4 is a View in longitudinal section on line 4,-4 of Fig. 3. Fig. 5 is a view 'in cross` section on line 5 5 of Fig. 4. Figs. (3 and 7 are detail views in elevation of the central attaching lug.` Fig. 8 is a VView 'in cross section on line 8-8 of Fig. 4. Figs. Sl and 10 are-detail views in elevation of` one of the end attaching lugs. Fig. 11 is a. view in cross section (upon an enlarged scale) online 11-1l of Fig. 4. Fig. .12 is a View similar to Fig. 1, but showing a modified form of shell or back. Fig. 13 is a` view similar to Fig. 12 with the attaching lugs in position. Fig. 14 is an outer face View or plan of the completed shoe embodying a modified form of tbe invention. Fig. 15 is a view partly in longitudinal section and partly in side elevation on line 15-15 of Fig. 14. Fig. 1G is a view in cross section on line 1(1- 16 of Fig. 15. Fig. 17 is a view in cross section on line 17-17 ofFig. 15. Fig. 1R is a view in cross section, upon an enlarged scale, on line 18-18 of Fig. 15. In Figs. 5,8, 11, 10, 17 and 18 the cast metal portion of the shoe is indicated in dotted lines.

My present invention is especially appli- Cable `to that class of brake shoes in which the body A is formed of cast metal, although features of the invention will be found applicable also to brake shoes in which the body of the shoe is composed in whole or -in part. of any of the compositions of material adapted for use inv brake shoes. At the back of the body :Aof the brak shoe, and preferably connected thereto in the casting operation, is a strengthening.

back B of ductile metal, `this backv being preferably in the shape of a pan or shell aving sides and ends b and' b preferably stamped or pressed integral with the back B. The back B is reinforcedfbyxvhat for convenience may be termed a supplemental bac-k. This supplemental back may be made of various forms and upon Sheet 1 of the drawings the supplemental back isshown as comprising reinforcing?` rods extending from `end to end of the brakeshoe, while mental back is shown mslstingofaplate' froml end. to end of the' brakesh oe.-`l

Referrmg to the form of 'thej invention firmly adhere toand coalesce with the body A, forming in effect a tough skinorfarmor for the back portion of the bodyA that Vwill effectively serve to aid in preventing the' fracture of the body A andguard against any danger of the falling away of anyA portion of the body A, even should fracture occur. The rods C whieh constitute the su'lrplexnental back give great strength to' the back portion of thesh'oe and are firmly locked to the back. bers Z0 form with the back B longitudinal cavities'l into which thev cast metal of the' body ofthe shoe will flow and form a dovetailed joint between the chambers 20 the wall of the back B.

.illustrated upon SheetA lof'fthedrawings, i i the reinforcing rods C are locked to theback cr shell B by being inclosed in longitudinal chambers 20 extending substantially Yfromlti The wallsof the'cham- While my invention as thus far described may be used with `attaching lugs of various types, I prefer to e'mploy a center lug such as is set forth and claimed in application, Serial No. 711,304,`tiled by me in the United States Patent Oflice July 24, 1912, and I prefer to employ end lugs such as are set forth and claimed in an application, Serial No. 711,305, tiled by me in the Unit/ed States Patent Ollice July 24, 1912. t I do not Wish to be understood, however, claiming in the present application the specie construct-ion of lugs set forth and claimed in the above mentioned applications.

When my improved attaching lugs are employed the back or shell of the shoe will be provided4 about its center with the slots 23, 23, and 24, 24, and about its ends with slots or holes 25, 26, 27 and 28 to receive the locking members of the lugs. The center lug is shown as haa/'ing a crown 30, side walls 31, brace walls 32 and base portions 33, as in my above mentioned application Serial No. 711,304; and from the base of the center lug depend the locking members-35, and 30, 36, the locking members 35, 35 being provided with slots 37 to receive the free ends ofthe locking members 36, 36, as will presently appear. Each of the end lugs comprises a transverse wall 40 adapted to extend across theend of the brake shoe, from which wall depend short locking members 41 and 42 and a longer locking member 43 having an opening 44 formed therein. At right angles to the transverse wall 40 extends an inwardly projecting part 4G from which rise thewvalls 47 and integral with the part 40 is formed a locking member 48.

In forming my improved brake shoe, the rods C will first be inclosed within the chambers 20 of the back or shell B, after which the attaching lugs will be placed in the position shown inithe drawings. This accomplished by passing the locking members 35 of the center lug through the openings 23, and the locking members.` 3o through the openings 24 of the back or shell B. After the locking members have thus been passed through the center openings of the back or shell B, the locking members will be turned outwardly about the rods C, and the locking members 36 will be passed through the holes 37 in the locking members 35, after which the free ends of the locking members 3G will be bent laterally` andinwardly, sothat the parts will assume the position shown in Fig. 5 ofthe draw-vv ings.

The locking member 43 of each of the endy lugs will be passed through the corresponding opening 25 adjacent the end of the back orshell l, while the locking 'members 41Y thesupplemental back or plate 'C'. `lthe locking members of the center and'end be passed through-.the opening 28 in the back or shell B. The locking members 41 and 42 )vill then be bent inwardly and partially around the chambers 20 of the back or shell B, as shown in Fig. 8, and the locking member 43 will be bent toward the center rof the shoe and the locking member 4S will be passed through the opening 44 of the member 43, and the free end of the locking member 48 will be bent inwardly, as shown iu Fig. 4 of the drawings. lVhen the attaching lugs have been thus secured in place, (as shown in Fig. 2 of the drawings), the body A `will be cast on to the back or shell B. Preferably, the back or shell is provided with openings b2 through which the cast metal will be poured into the mold that forms the body,A. vlVhen the body metal is thus cast on to theback or shell B, it will not only firmly adhere to and unite with the back, but will also flow around and unite f with the lockingmembers of the center and end lugs and thus effectively prevent any possibility of the withdrawal ot' the lugs under the severe' strainsito which the shoes are subjected.

In the modified form of my invention illustrated upon Sheet; 2 of the drawings, the back .or shell B' is shownv as reinforced by a supplemental back or plate C' that is inclosed within a chamber or recess 20a formed in the back B'. The edges of the supplemental back or plate C' are inclined or beveled, as clearly shown in Figs. 16 to 18 of the drawings, and the walls of the chamber or recess 20 are correspondingly inclined to engage the beveled edges of the plate C'. By this means the plate is se curely interloclted with the back or shell of the shoe. The plate C' will be formed `with openings adapted to coincide with the openings bg of the back or shell B', as shown in Figs. 14 and 15 of the drawings. In this form of my invention, as in that. hereinbe` fore described, the back or shell ll' is pro- `vided with slots or holes about its center and ends to receive the locking members of the attaching lugs, the construction of which has been already fully set forth. lVhen the supplemental back or plate C' covers the greater portion of the back or shell B', as in the form of the invention shown upon Sheet 2 of the drawings, the plate C' will be formed about its centerand ends with slots or holes corresponding to and adapted to coincide with the slots or holes atA the center and ends of the back or shell B', so that the locking members of the attaching luffs will pass through the slots or holes of `both the back or shell B' and llhcn lugs have been passed through the bach or shell B' and the supplemental back or plate` C', these locking memberswill be bent to the a body havmg a back of duetxle metal c iambered Substantially from end to end thereot and a positions shown in Figs. 13, 15 and 1G and 3. brake shoe comprisin 1T of the drawings. AUter the center and end attaching lugs have been thus fastened in position, the body metal will be cast on tothe back in manner hereinbefore'described. ln this form otl the inventlon.r as in that illustrated upon Sheet. l of the drawings. the metal of which the body A is composed will tlow into the recesses 31 and t'orm thereal a dovetailed joint with the back or shell B.

The term supplemental back as used herein, is to be understood as including any suitable reinforcing member adapted to supplement the back or shell l and strengthen the shoe. The metal of the supplemental back is considerably thicker than the metal of the back or shell B and can be made as thick or heavy as may be required.

lt will be understood that the details of construction above set out may be varied without departure. fronti the spirit ot' the in vention. and that features of the invention may be employed without` its adoption as an entirety. Thus, for example, while l have shown the body ot the shoe as provided with a pan-shaped back, it is obvious that the features ot providing a back having a supplemental back locked thereto may be used, whether the back itself be formed with side and end walls, or not.

Having thus described my invention, what l Claim as new`r and desire to secure by Letters latent`r is:---

1. A brake shoe Comprising a body havingr a longitudinally recessed. ductile metal back and a supplemental back locked thereto by integral parts of said duetile metal back.

2. A brake shoe comprisingr a body having a longitudinally recessed, duetile metal back and a supplemental back of duetile metal within .said recessed back, said recessed back being bent to engage and retain said supplemental back in position.

supplemental back ot duetile metal inclosed within said chambered back.

sl. A brake shoe comprising a body having a back ot' ductile metal formed with a longitudinal chamber and a supplemental hack located within said chamber, the walls ot' lsaid duct'ile metal back be'ing bent to engage and retain said supplemental back.

5. A brake shoe comprisingr a body having a duetile metal hack bent to Vform a chamber opening from the exterior and a supplemental back located within Lsaid chamber.

(i. A brake shoe comprising a body having a duclile metal back bent to form a chamber projecting inwardly and having contracted walls, and a supplemental back located within said chamber, said chamber being embedded in the body of the shoe.

7. A brake shoe comprising a body having a back ot' thin ductile metal and a thicker supplemental back locked thereto by integral bent parts ol said ductile metal back.

8. A brake shoe Comprising a body having a pan-shaped back otl thin duet'ile metal, said back being recessed longitudinally between its side walls and a supplemental back ot' ductile metal located within said recessed back.

tl. A brake shoe comprising a body having a back ot' thin ductile metal recessed between its side 'alls and a supplemental back of thicker ductile metaly secured within said recessed back, and a lug for attachment to the brake head passing through said back and interlocking with said back and said supplemental back.

I CLIFTON l). PETTIS, lVitnesses Geo. P, Fisnm, KA'rnAmNii (intimen. 

